Customer was having issues with hot water getting Luke warm while showering. They also had a leak on the T&P. After some troubleshooting I determined the prv had failed and caused T&P to fail. And there were no check valves installed on the recirculating line causing bleed over. I replaced prv, thermal expansion tank, T&P, and added two check valves to the system. One before water heater and recirculating branch, and one after the pump itself. Purged air from system and checked for leaks. No leaks.